CP3SP33SMSSLASHNOPB datasheet(258/407 Pages) TI1

258 / 407 page

CVSD/PCM Converter 0

CVSDIN0

CVSDOUT0

PCMOUT0

PCMIN0

CVSDIN1

CVSDOUT1

PCMOUT1

PCMIN1

ATDR1

ARDR1

ATDR0

ARDR0

DS447

AAI

CVSD/PCM Converter 1

Bluetooth RAM

ATDR2

ARDR2

CP3SP33

SNOSCW5 – MAY 2013

www.ti.com

Figure 26-2. CVSD/PCM To/From AAI Data Flow

The CVSD/PCM modules can operate in two basic modes: fixed-rate mode and free-run mode. In the

fixed-rate mode, the clock frequency supplied to CVSD/PCM module 0 on Auxiliary Clock 2 (or Auxiliary

Clock 3 for CVSD/PCM module 1) must be exactly 2 MHz. In the fixed-rate mode, the CVSD/PCM module

will expect to receive 8000 PCM samples per second on its PCMIN input, and it will produce 4000 words

per second on the CVSDOUT output. Each word holds 16 bits of the CVSD-encoded bit stream. It will also

expect to receive 16-bit CVSD-encoded data words at a rate of 4000 per second on its CVSDIN input and

will produce PCM samples at a rate of 8000 per second on its PCMOUT output.

In the free-run mode the Auxiliary Clocks can be set to any frequency up to a maximum equal to the

PCLK Clock frequency. In this mode, the CVSD/PCM module will request a new PCM sample every 250

cycles of the Auxiliary Clock, and it will produce a new CVSD data word every 500 cycles of the Auxiliary

Clock.

The following examples illustrate the flow of CVSD data in typical applications.

26.9.1 Dual CVSD Channels to AAI

This model is illustrated in Figure 26-3 and has the following characteristics.

•

Two bidirectional CVSD channels through the Bluetooth LLC.

•

PCM data received by the AAI.

•

CVSD/PCM conversion done on-chip.

•

PCM audio data is transferred between the AAI and the CVSD/PCM module by means of DMA.

•

CVSD audio data is transferred between the CVSD/PCM module and the Bluetooth RAM by means of

DMA.

•

CVSD/PCM modules operate in fixed-rate mode using a 2 MHz clock supplied on Auxiliary Clocks 2

and 3.

258

Dual CVSD/PCM Conversion Modules

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